[ECOS] bug in eth_drv_send (memory overwrite)

[Deak, Ferenc]

> 
> But the check is made *after* the list length has been incremented.  It
> is valid for sg_len to be equal to MAX_ETH_DRV_SG at this point.

Put a line 
  if (sg_len == MAX_ETH_DRV_SG) diag_print("ARRAY OVERWRITE\n");
after writing sg_list.

exactly:

693: 	sg_list[sg_len].buf = (CYG_ADDRESS)data;
694: 	sg_list[sg_len].len = len;		// !!!!!! largest sg_len here is MAX_ETH_DRV_SG
new:		if (sg_len == MAX_ETH_DRV_SG) diag_print("ARRAY OVERWRITE\n");
 
Sorry if I'm wrong.



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